Differences

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--- stm32:peripherals:gpio_output [2016/02/25 08:11] – feur
+++ stm32:peripherals:gpio_output [2022/12/28 08:17] (current) – ruan
@@ Line 1: / Line 1: @@
 ====== General Purpose Output ======
-  * The output buffer is enabled (open drain or push-pull).
+  * The [[#OTYPER|output buffer]] is enabled (open drain or push-pull).
   * The Schmitt trigger input is active.
-  * The pull-up and -down resistors are active, according to [[gpio#registers|PUPDR]].
+  * The pull-up and -down resistors are active, according to [[#registers|PUPDR]].
   * Input data is sampled every AHB clock.
   * Input data register holds I/O state.
@@ Line 9: / Line 9: @@
 \\ {{gpio_output.svg}} \\ \\
+===== Programming Instructions =====
+==== Enable Peripheral ====
+Make sure the peripheral is enabled:
+  * Enable GPIOx in ''RCC->AHBENR[0]''.
+==== Setup output mode ====
+Configure the MODE and PUPDR as well as the output type and speed register, \\ for every pin that should act as digital output:
+  * Write ''0x01'' to the corresponding fields in ''GPIOx->MODE''.
+  * Configure pull-up / -down in ''GPIOx->PUPDR''.
+  * Configure output type in ''GPIOx->OTYPER''. \\ (in conjunction with ''GPIOx->PUPDR'')
+  * Configure output speed in ''GPIOx->OSPEEDR''.
+\\
 ===== Configuration Registers =====
-==== MODER - Mode register ====
+==== GPIOx_MODER - Port mode register ====
 \\ {{gpio_reg_common.svg}} \\ \\
-|< 100% 5em >|
+|< 100% 5em 5em >|
-|01|Output mode (reset state)|
+|Pin x|01|Output mode|
-==== PUPDR - Push-up / pull-down register ====
+==== GPIOx_PUPDR - Port pull-up / pull-down register ====
 \\ {{gpio_reg_common.svg}} \\ \\
-|< 100% 5em >|
+|< 100% 5em 5em >|
-|00|No pull-up, pull-down (reset state)|
+|Pin x|00|No pull-up, pull-down (reset state)|
-|01|Pull-up|
+|:::|01|Pull-up|
-|10|Pull-down|
+|:::|10|Pull-down|
+|:::|11|Reserved|
-==== OTYPER - Output type register ====
+==== GPIOx_OTYPER - Port output type register ====
 \\ {{gpio_reg_otyper.svg}} \\ \\
-|< 100% 5em >|
+|< 100% 5em 5em >|
-|0|Output type: push-pull (reset state)|
+|Pin x|0|Output type: push-pull (reset state)|
-|1|Output type: open-drain|
+|:::|1|Output type: open-drain|
-==== OSPEEDR - Output speed register ====
+==== GPIOx_OSPEEDR - Port output speed register ====
 \\ {{gpio_reg_common.svg}} \\ \\
-|< 100% 5em >|
+|< 100% 5em 5em >|
-|00|Speed: 2 MHz (reset state)|
+|Pin x|00|Speed: 2 MHz (reset state)|
-|01|Speed: 10 MHz|
+|:::|01|Speed: 10 MHz|
-|10|Speed: 50 MHz|
+|:::|10|Speed: 50 MHz|
-|11|Speed: 100 MHz|
+|:::|11|Speed: 100 MHz|
 ===== Data Registers =====
-==== ODR - Output data register ====
+==== GPIOx_ODR - Port output data register ====
 \\ {{gpio_reg_odr.svg}} \\ \\
-==== BSRR - Bit set / reset register ====
+|< 100% 5em 5em >|
+|ODx|0|Clear/reset pin x|
+|:::|1|Set pin x|
-\\ {{gpio_reg_bsrr.svg}} \\ \\
+==== GPIOx_BSRR Port bit set / reset register ====
-|< 100% 5em >|
+\\ {{gpio_reg_bsrr.svg}} \\ \\
-|BSx|Set pin x|
-|BRx|Clear/reset pin x|
-===== Legend =====
+|< 100% 5em 5em >|
+|BSx|0|No effect|
+|:::|1|Set pin x|
+|BRx|0|No effext|
+|:::|1|Clear/reset pin x|
-\\ {{legende.svg}} \\ \\